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[tsan] fix instrumentation of vector vptr updates (https://code.google.com/p/thread-sanitizer/issues/detail?id=43)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196079 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2013-12-02 08:07:15 +00:00
parent bc134cb1f1
commit dfb74a58c5
2 changed files with 24 additions and 4 deletions
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11
lib/Transforms/Instrumentation/ThreadSanitizer.cpp
View File

@ -402,13 +402,16 @@ bool ThreadSanitizer::instrumentLoadOrStore(Instruction *I) {
if (IsWrite && isVtableAccess(I)) {
DEBUG(dbgs() << " VPTR : " << *I << "\n");
Value *StoredValue = cast<StoreInst>(I)->getValueOperand();
// StoredValue does not necessary have a pointer type.
if (isa<IntegerType>(StoredValue->getType()))
StoredValue = IRB.CreateIntToPtr(StoredValue, IRB.getInt8PtrTy());
// StoredValue may be a vector type if we are storing several vptrs at once.
// In this case, just take the first element of the vector since this is
// enough to find vptr races.
if (isa<VectorType>(StoredValue->getType()))
StoredValue = IRB.CreateExtractElement(
StoredValue, ConstantInt::get(IRB.getInt32Ty(), 0));
// Call TsanVptrUpdate.
IRB.CreateCall2(TsanVptrUpdate,
IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy()));
IRB.CreateBitCast(StoredValue, IRB.getInt8PtrTy()));
NumInstrumentedVtableWrites++;
return true;
}

17
test/Instrumentation/ThreadSanitizer/vptr_update.ll
View File

@ -4,10 +4,27 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
define void @Foo(i8** nocapture %a, i8* %b) nounwind uwtable sanitize_thread {
entry:
; CHECK-LABEL: @Foo
; CHECK: call void @__tsan_vptr_update
; CHECK: ret void
store i8* %b, i8** %a, align 8, !tbaa !0
ret void
}
declare i32 @Func1()
declare i32 @Func2()
; Test that we properly handle vector stores marked as vtable updates.
define void @VectorVptrUpdate(<2 x i8*>* nocapture %a, i8* %b) nounwind uwtable sanitize_thread {
entry:
; CHECK-LABEL: @VectorVptrUpdate
; CHECK: call void @__tsan_vptr_update{{.*}}Func1
; CHECK-NOT: call void @__tsan_vptr_update
; CHECK: ret void
store <2 x i8 *> <i8* bitcast(i32 ()* @Func1 to i8 *), i8* bitcast(i32 ()* @Func2 to i8 *)>, <2 x i8 *>* %a, align 8, !tbaa !0
ret void
}
!0 = metadata !{metadata !2, metadata !2, i64 0}
!1 = metadata !{metadata !"Simple C/C++ TBAA", null}
!2 = metadata !{metadata !"vtable pointer", metadata !1}